4
C
Heat-running and zero point adjustment
(1) Place the Function Switch to either of Air Velocity or Static Pressure position. Then put the
sensor cap on the probe and run the heat for more than 5 minutes. The pointer will gradually
return to zero point from left (minus).
*
This is the time required to stabilize after electric current flows through the circuit and the
sensor.
(2) If the pointer does not point to zero of the scale after the heat-running, set the pointer to zero
by turning the rotary switch of zero point adjustment.
*
For fine adjustment, place the Range Selector Switch to HIGH first. Then switch the Range
Selector Switch to LOW position and adjust it again.
Note
: Be sure to make the zero point adjustment under normal temperature (at 20°C±15°C).
If the pointer fully points to the left (minus) or right (plus) end, turn function switch to
Power-Off position and contact us since it will not be normal.
⚫
Measurement range (Range Selector)
Measuring ranges of air velocity, temperature and static pressure are as follows.
Select HIGH and LOW depending on the circumstances.
Range
LOW
HIGH
Air velocity
0.5 to 3 m/sec.
3 to 40 m/sec.
Temperature
0 to 60°C
60 to 120°C
Static pressure
0 to 500 Pa
500 to 4500 Pa
⚫
How to measure air velocity
(1) Place Function Switch in Air Velocity position. Put the sensor cap on the probe and make
zero point adjustment.
Note:
Place Range Selector Switch in HIGH position when air velocity cannot be estimated.
(2) Measure air velocity facing the wind direction mark of the probe
(red arrow mark under the detection window) to windward.
Note:
Face the detection window vertically against the wind
direction. If the mark is aslant against the wind direction, the
air velocity will be indicated higher than the actual value.
* When the ambient temperature to be measured is high, it will take some time until the
temperature of sensor section rises to the ambient temperature (about 3 minutes at 100°C).
Take measurement after the temperature of sensor section is fully stabilized. Also, when
taking measurement in a normal ambient temperature in LOW range (lower than 3 m/sec.)
wait until the temperature is fully stabilized.
wind
wind
direction
mark
